Process and apparatus for degassing boiler feed water



y 4, 1954 A. KRETZSCHMAR PROCESS AND APPARATUS FOR DEGASSING BOILER FEEDWATER Filed Oct. 25, 1951 111,. I if I l 41 I 11, hr lil I" I I M 'illinw Ill lllU ll: i]

Patented May 4, 1954 PROCESS ND APPARATUS OR DEGAI'SSING BOILER FEEDWATER Alfred-Kretzsclimar, Kuln bacli, Germanyf Application cassa a,19s'i',; stsa1ita; 252,787

Claims priority, application German 7 November 1551 0. 1."

I Th invention relates to a process, especially adapted for degassingboiler feed water, and to an apparatus for performing the mentionedprocess.

According to the invention the feed water to be dc afisfid is mixed inapressure, andmixing. cham-v be); with water of condensation deliveredeng, from a preheater, vaporizer etc. .The water, is then atomi zedbymeans of nozzles and the atomized water is caught by perforated sheetsof metal i a bowl'may'be conducted through a dipping tube provided atthe bowl and leading into the boiling vessel. Suitably steam is suppliedtothe boiling vesselthrough tangentially; arranged or tangentially andcentrally directed nozzles. By means of those nozz1esthementioned quickboilin 50f the watertakes placein the shortest time asthe waterislcausedto whirl with the steama t i For performing the processaccording to the in-. vention a degassin apparatus maybe usedcomprisinga pressure and inixingchamber provided with inlet tubes forthe untreated water and the condensate and with; a, bottom providedwithspraying nozzles. :This bottom is followed by a chamber in whichperforatedsheets ar provided for trickling the. atomized Water. Belowthe per: foratedsheets, bowls are arranged opening with a clipping tubeinto a boiling vessel heated by steam. This apparatus is provided aboveafeed water container which may stand erect. In this case the containerof the degassing apparatus smallerif the apparatus is so. constructed.

ord nate. theirivention;ou letlp f the fumes may suitably be provided,centrally I12. ciaimsi lolyiiisias) arrangedvand' passing preferablythrough the uppenpressure and mixing chamber. Fume condensers insertedinto the steam outlet pip serve forrcausing the fumes to deposit.

The-fresh water andthe condensate may be tangentially introduced throughspiral-like bent tubesprovided with exit openings; the heating steam isintroduced into the water, preferably by nozzles whichmaytangentiallyadmit the water to the walls of the boiling vessel.

. Accordin to the invention a degassing plant is produced in whichthe-water may be atomized, trickledlz and heated; centrally in thedegassing container. Thus, according to the invention, it becomespossible, to tangentially, introduce the condensate was. well as; the.heating steam and, if suitable, also the feed. water.

According to a further feature of theinvention the degassing apparatusand thefeed water container may form a unitary structure without specialflange,connection between th degassing apparatus and the; feed watercontainer. 7}

. As proved, byzextensive tests it is possible to nearlyjentirelygremove, the gases contained in the feed water. It has becomepossible to expel the; gasesaupg-sto hardlymeasurable residues, whichmeans'anexcellent result. o

Further detailsof the invention may be seen fromttheiembodimentillustrated in the accompanyingdrawing 1 F1211. isa longitudinal sectionthrough a plant according: ;t 0 the iinventionarranged aboye a verticalfeed water container 1=&Figs.12"and;:3 aresections inthe direction ofthe lines A -B. and C-D of 'Fig l respectively.

--.The e d water t .be de assed is, supplied to the ressure and mixingchamber 2 through the pipe] :5 To; this chamber also condensate issuprough thepipe 3. extending into the chamtheshape, ofispirals A and 5as to be seen frorn'g Flignj2. The spirals have exit openings 6 for thecondensate, In consequence of the arrangementaccording to the inventionan intimate rnixing of condensate and feed water results in tbecha betthe ot o 1 f this p es: sureandmixingchamber 2 nozzles 8 are providedfor atpmizing the, mixed fiuid. The atomized fluid isfed by means'of thenozzles 8 into the s a rlerespe forated. shee s we e p qvideil forcatchlngnthe atomized water, The water tricklesthrough the holes in theperf orated sheets it), into the space I l,-wh ereit is'collected bymeans iabowl l2. a p rt al ysubm rse p p {Head thetr-ick-led fluidinto"a I boiling vessel; l4; into which a so heati s am is supp ied h oughthe pine. li and the dis ri utin p pes .153 ,rAt the endsof the pipesl6; exit nozzles: 11 are;providedv as to be seen from Fig. 3, saidnozzles beingad: bis able nd. tan entially directed towards theflgcthearcontainerc 'Ihe enterlngzsteam whirls-up the water in thecontainer so that it is heated to the boiling temperature in theshortest time. Thus the remainin trace of gases which are still left inthe water are expelled. The fluid heated to the boiling temperature runsover the edge of the boiling vessel as indicated at I8 and flows intothe feed water container 19 which, in the illustrated embodiment, formsa unitary structure with the degassing apparatus. At the deliveryoutlets 20 of the degassed feed water additional heating steam nozzles2| are provided in the feed water container, fed by the pipe 22. Thusthe degassed water delivered from th outlets 20 has a boilingtemperature.

Generally an additional heating steam plant at the outlets is notrequired if the feed water container [9 is horizontally arranged. Inthis case the container and the degassing apparatus form also a unit sothat special iiange connections between degassing apparatus and feedwater contai-ner are superfluous in connection with the verticalarrangement of the feed water container as well as with the horizontalarrangement. By the construction of the apparatus as suggested and as tobe seen from the drawing the tangential introduction of the steam, ofthe condensate and, if required, also of the feed water is assisted.

The outlet 23 of the fumes passes through the mixing and pressurechamber 2 in the middle of the container. Fume condensers 2 areconnected with the outlet '23 by means of pipes 24, in which condensersthe fumes :deposit.

'What I claim is:

l. A process for degassing boiler feed water consisting in mixing theuntreated feed water to be degassed with water of condensation,atomizing the mixture, catching the atomized mixture by perforatedsheets, trickling it through said sheets, collecting the trickling waterand boiling it.

2. A process for degassin boiler feed water consistin in mixing theuntreated feed water to be degassed with water of condensation,atomizing the mixture, catching the atomized mixture by perforatedsheets, trickling it through said sheets, collecting the tricklingwater, and supplying heating steam, thereby heatin the water to theboiling temperature.

3. -A process for degassing boiler feed water consisting in supplyingthe untreated feed water to be degassed and a proportion of water ofcondensation to a mixing chamber in a direction tangential to the wallof the chamber, mixing the supplied substances, atomizing the mixture,catchin the atomized mixture by perforated sheets, trickling it throughsaid sheets, collecting the trick-ling water and boiling it.

4. An apparatus for-degassing feed water comprising, in combination, apressure and mixing chamber, inlet pipes leading into said chamber andadapted to supply untreated water and water of condensation, atomizingnozzles provided at the bottom of said chamber, an enclosure adjacentsaid chamber, perforated sheets arranged in said enclosureand adapted totrickle the atomized water supplied by said nozzles, a bowl arrangedbelow said sheets and adapted to catch the trick-ling water, a boilingvessel arranged below said bowl, a pipe connected with said bowl anddipping "into said :bo'iling vessel :and a feed water container-arrangedbelow said boiling vessel and adapted to receive the water from theboiling vessel.

5. An apparatus for degassing feed water as claimed in claim 4 incombination with means 4 adapted to supply th untreated water and thewater of condensation to said pressure and mixing chamber tangentiallyto the wall of said chamber.

6. An apparatus for degassing feed water as claimed in claim 4 incombination with means coacting with said boiling vessel and adapted tosupply heating steam to it.

7. An apparatus for degassing feed water consisting of a degassing plantand a feed water container, the degassing plant comprising a pressureand mixing chamber, inlet pipes leading into said chamber and adapted tosupply untreated water and water of condensation, atomizing nozzlesprovided at the bottom of said chamber, an enclosure adjacent saidchamber, perforated sheets arranged in said enclosure and adapted totrickle the atomized water supplied by said nozzles, a bowl arrangedbelow said sheets and adapted to catch the trickling water, a boilingvessel arranged below said bowl, a pipe connected with said bowl anddipping into said boiling vessel; and said feed water container beingarranged below said boiling vessel and forming a unitary structure withsaid degassin plant.

8. An apparatus for degassing feed water as claimed in claim 7 incombination with additional nozzles provided in the lower portion of thefeed water container and adapted to supply heating steam, the saiddegassing plant and feed water container being arranged vertically oneabove the other.

9. An apparatus for degassin feed water as claimed claim 4 incombination with an exit pipe for the fumes.

10. An apparatus for degassing feed water as claimed in claim 4 incombination with an exit pipe for the fumes, centrally arranged andpassing through the pressure and mixing chamber.

11. An apparatus for degassing feed water as claimed in claim 4 incombination with an exit pipe for the fumes, centrally arranged andpassing through the pressure and mixing chamber, and :a fume condenserinserted into said exit pipe.

'12. An apparatus for degassing feed water as claimed in claim 4 incombination with spirally bent pipes arranged within said pressure andmixing chamber provided with exit openings, continuing the said inletpipes and adapted to supply the untreated water and the water ofcondensation to said pressure and mixing chamber tangentially -to thewall of said chamber.

13. An apparatus for degassing feed water as claimed in claim 4-incombination with means coacting with said boiling vessel and adapted tosupply heating steam to it, said means comprising nozzles adapted toadmit the heating steam tangentially to the Walls of the boiling vessel.

